Syringe



the' result' that perfect sterilization cannotv Patented oct. 26, 1926.'-

UNITED STATES l1,604,224l ,PATENT oFFlcE.

BENJAMIN Fmnnmm, or NW Yoan, N. Y.

BYBINGE.

Application filed July 21,

, through the usual type of hypodermic needle, common to variousl types of medical instruments. l

In the present practice of injecting fluids to produce temporary or` -local anesthesia, the preparation or compound is generally contained in a sealed, glass tube or container and subsequently used in the syringe\as desired. The preparation is usually .withdrawn from the container into the syringe and then injected, which necessitates that the interior of the syringe be preliminarily sterilized. ln any event, the fluid comesin contactwith the metal of the syringe with be had. In certain types of syringes, where the iuid is forced through the glass tube or container, unequal pressure of the syringe proper onthe end of the glass tube, very often produces a. fracture with the result that the greater portion of the preparation is lost andendan ers both the patient and the physician.'v here vthe same syringe is used `forinjecting various kinds of preparations or anesthetics, there is always the danger of infection when anyv ortion of the syringe comes in contact wit the fluid in view of the fact that it isv very diiiicult to obtain perfect sterilization;

One of the objects, therefore, of my invention is to produce a syringe to overcome the above diiiiculties in which sterilization of the instrument is afforded in that only the needle end need be sterilized.

Another object o f my invention is to produce a syringe that w1ll not'leak, avoiding the necessity of washers,` hinges, springs and other mechanical parts, which are easily broken, get out of order or effect the eiiicien operation of the instrument.

A further object of my invention is to pros duce a syringe, particularly applicable for use in connection' with sealed, fragile, Huid containers, whereinA the .only part of -the syringe that may come in contact with the preparation is the needle, thus producing the most ideal condition forl injecting the iuid to produce the results intended.

To enable'v others skilled in the art to fully comprehend the underlying features of my invention. that they may embody the. samel in the various modifications in structure and 1925. Serial No. 45,015.

relation contemplated, drawings depicting apreferred form have been annexed as a part of this disclosure and in such drawings similar reference characters denote corre'- sponding parts throughout all the views, of which Figure 1 is'a sectionalview through the I syringe.

. Figure 2 1s a side view.

Flgure 3 1s an enlarged, sectional view through the barrel and fluid container showin the container 7 and -befobserved during the operation of the syringe in the manner subsequently to be referred to.

The upper end of the barrel 5 is threaded as indicated by numeral 8 to which is attachedNan internally threaded collar9. The

Acollar 9 is provided with shoulders 10 to which a iin er grip 11 is connected for cooperation'wlth the usual palm grip 12, lo

cated on the upper end of a plunger rod 13. flhe lunger 13 passes-through a bore 14 u1 a ed head 15, the lower portion of said headv being threaded'. The bottom of the head 15 forms a seat fora gasket 16, said gasket being preferablyof rubber' and adapted to act as an abutment for the upper egd of the glass container so as to prevent the fracture of the said container when pressure is applied thereto. A plunger head 17 on the `lower end of the plunger rod 13 is adapted to force the sealed stopper 18 through the container 47 and thus eject the fluid or preparation in the manner now to 100 be described.

In'the form ofsthe invention as shown by Fig. 3, it will be observed that the barrel' 5 is-,externally threadedat its lower portion `19, there beingaa non-threadedvportlon 19a which permits the internally threaded cup or cap 20 to be slipped on the `end of the barrel softhat theneedle point or piercer may bei properly .centered and forced through the end-stopper 24 of the sealed container, before the said cup or cap is threaded on the barrel end. Consequently, the piercer does not come in contact with any portion of the syringe proper or the sealed container but directly enters the stopper which is sterile, thus preventing contamination or danger of infection. When the cup or cap is slipped on the end of the barrel by reason of the nonthreaded portions the piercer lirst penetrates through the stopper before the threads are engaged whereupon the cup or cap may be then threaded on the barrel and securely positioned. The stem 21 of the cup or cap, is provided with a central bore 22 to permit the passage of the needle. The needle 25'is held in a needle holder 26, which may be threaded to the stem 21. In .this form of the invention, the cap 20 and the needle holder 26, supporting the needle, may be positioned on the lower end of the barrel as a unit so that by rotating and threading the same thereon, the piercer 23 will ypass through the flanged stopper 24 and.conse quently, the iuidwill be forced through the needle point as is well understood. A stop27 between the piercer 23 and the needle 25 proper limits the movements of the needle and assists in centering it so that the stopper 24 is properly pierced axially for the passage of the liquid therethrough in the manner well understood.

'In the form of the invention as shown by Figure 4, the threaded cap and needle holder are formed integral with each other and consist of an internally threaded cup-Shaped ,member 28, threaded on the lower end 19 of the barrel. 4It will be observed that the piercer 23 extends just below the top of the cup 28 and is also adapted to pass through the stopper 24 in the same manner. as described 1n connection with Figure 3. rIhe lowerend of the cup-shaped member 28 is in the form of a cone 29 and is centrall bored for the passage of the needlel25, sai needle beingv also provided with the stop 27 land a seat 30.

In actual practice and use of the syringe, the plunger rod 13 isuwithdrawn to the posii tion as shown by Figure 1 and the glass tube'or container is inserted in the barrel until' the upper end abuts and' engages the rubber gasket 16. The needle and needle holder are then attached to the lower end of the barrel .and in so positioning it, the

the fiuid and that the threading of the cap on the barrel punctures and pierces the stopper 24 whereby the fluid may be passed therethrough and through the needle,`above` referred t0.

tWhile I have illustratedand described my `therein may be made.

Leoaaaa invention with some degree of particularity, I realize that 'in practice various alterations I therefore reserve the right and privilege of changing the form vof the details of construction or, otherwise altering the arrangement of the correlated parts without departing from the spirit of the invention or the scope of the appended ends, a needle holder and a combined hypo dermic needle and piercer removably connected to-one end of the barrel, said piercer being adapted to be forced through one end of the sealed container when the holder is positioned, a head attached to the opposite end nof the barrel, a resilient seat inthe bottom of the head constituting an abutmentfor one end of the sealed container and a plunger passing through the head for forcing the seal at the opposite end of the container whereby the contents is driven through the piercer and needle.

2. A syringe of the class described comprising a barrel having a cylindrical open chamber extending throughout its length and adapted to receive a container sealed at both ends, a needle holder and a combined hypodermic needle and piercer threaded to one end of the barrel, said holder and barrel having a non-threaded portion whereby the piercer may be centered and forced through the sealed end of 'the container, a head attached to the opposite end of the barrel, a finger grip carried by the head, a resilient seat .in the bottom of the head constituting an abutment for one end of the sealed ,container and a plunger having a palm grip passing through the head for forcing the seal at the opposite end of the Container therethrough whereby the contents is driven through the piercer and needle.

3. A syringe of the class described comprising a barrel having a cylindrical chamber extending throughout its length and adapted to receive a container lsealed at both ends, said Xbarrel being open whereby the contents of said container may be observed, a needle holder threaded on the lower end of the barrel, a hypodermic need e and piercer seated within the holder, said holder and barrel having a non-'threaded 'portion wherebyY said piercerv may be centered and forced through the seal at one end of the container, a head and a threaded' collar carriedy thereby threaded at thetopof the barrel, a finger'grip attached the head to engage the seal atthe opposite to the collar, a plunger, passing through end of the container and a gasket located at the bottom of the head for preventing fracture of said cont-ainer as pressure is applied by the plunger to force the contents of the container through the piercer and needle.

Il. A. syringe ofthe class described comprising a' barrel having an open cylindrical chamber extending throughout its length and adapted to receive a transparent container sealed at both ends; a cap having a threaded stem connected to one end of the barrel, a needle holder threaded on the stem, said cap and needle holder having a central bore therethrough, a combined hypodermic needle and piercer seated Within the needle holder', said holder and barrel end having a non-threaded portion whereby saidI piercer may penetrate the sealed end of the container before the holder is threaded onthereof passing through the head, the lower end of the plunger rod having a head to engage the seal at the opposite endof the container whereby the last mentioned seal may be forced into the said container and its contents discharged through the piercer and needle.

In testimony whereof I aix my signature.

BENJAMIN FRIEDMAN. 

